Adopt three more open benchmark PRs - #246

Summary

• Lands three more open benchmark PRs in two commits, with every contributor credited as co-author. Add more examples to infinite loops #228 and Add 'Begin Until' to the loop battle #143 change the same file, so they land together.
• Each one is brought up to today's rules: winner named by rank methods and listed first, runs on every Ruby in CI, same work in every report.
• README entries keep every run instead of only the latest: older samples from the git history, the contributors' own, and new runs.

Changes

Step 1: String#match? vs String#include? vs String#=~ for a fixed substring (#139 by @lvl0nax)

• add substring inclusion checking #139 added String#include? to the Regexp benchmark, ===-vs-=~-vs-match.rb. include? looks for a fixed substring, it does not match a Regexp, so it gets its own file, string/include-vs-match.rb, against the Regexp ways to find the same substring.
• The PR found include? about 2x faster than =~ on Ruby 2.4.2, and it still beats =~ everywhere. String#match?, added in Ruby 2.4, is as fast or faster on current CRuby (1.39x ahead of include? on 3.4, 1.17x on 4.0), so it is named the winner. Its report only runs on Ruby 2.4+.
• The === entry in the README gets back its Ruby 2.2.2 sample from the git history, and keeps add substring inclusion checking #139's Ruby 2.4.2 run with a note. The new entry has runs on Ruby 3.4 and 4.0.7.

Step 2: begin...end until, until false and an endless range in loop vs while true (#143 by @styd, #228 by @ydakuka)

• Five reports in the existing loop-vs-while-true.rb, whose name and labels stay, so its results keep their history: begin...end until (first on Ruby 2.1 and 3.4), while true, until false, loop, and the endless range. The three loops that test a condition tie on Ruby 4.0.
• (0..) is Ruby 2.6+ syntax, which older Rubies cannot parse, so that method is defined from a string with eval and its report only runs on 2.6+. (0..Float::INFINITY) would parse, but it measured 2x to 2.6x slower than (0..).
• Drops the editor swap file .README.md.swp that Add 'Begin Until' to the loop battle #143 committed.
• The README entry names all five and keeps every run: 2.2.3 from the git history, 2.5.0 from Add 'Begin Until' to the loop battle #143, 3.3.0dev from Add more examples to infinite loops #228, 3.4 and 4.0.7 new, and 4.0.0 as on main.

Test plan

• The lint passes all 76 files, and RuboCop's quote check passes on both changed benchmark files.
• Crash check: include-vs-match.rb runs on Ruby 2.1 and JRuby 9.1. loop-vs-while-true.rb runs four reports on 2.1, 2.5 and JRuby 9.1, and all five on 2.6 and TruffleRuby 22.
• Real runs, one each in Docker: include-vs-match.rb on 2.1, 2.5, 3.4, 4.0, JRuby head and TruffleRuby head; loop-vs-while-true.rb on 3.4 and 4.0 (and an earlier version, with (0..Float::INFINITY), on 2.1).
• CI runs only the changed files, on all 26 jobs.

After this merges, #139, #143 and #228 each get a comment saying where they landed, and are closed.